The drain tile is doing its job. I would say get a bigger pump. Compare GPH at the rise you have. Also look at service factor for run time. A more powerful pump will not have to work as hard to move the same amount of water. Run the pump at the voltage it is built or wired to run at. 120 into a 240V motor will burn it out.
Also check that there is not an easy path for the water from your discharge back to the buried tile.
Another thing to consider is a battery backup pump that has a float set just above the "on" position of the main pump. That way if the main one can't keep up the other pump will help out for peak water flow. It will also help in case of power failure.